Unwilling to change one's views (12)
I believe the answer is:
intransigent
'unwilling to change one's views' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for intransigent that I've seen before include "Unwilling to change one's views" , "Irreconcilable" , "Diehard" , "becomes immovable" , "Not prepared to adapt or compromise" .)